Manifold



Dec. 23; 1930.

5.5. MacPHERSON MANIFOLD Filed Ma '16; 1927 2 Sheets-Sheet 1 Q lmmm [5792 i /766'/D//6)'5 a/Z Patented Dec. 23, 1930 UNITED STATES PATENT OFFICE EARLE S. MACPHERSON, OF DETROIT, MICHIGAN, ASSIGNOR TO HUPP MOTOR CAB. COR- PORATION, OF DETROIT, MICHIGAN, A CORPORATION OF VIRGINIA MANIFOLD Application filed Kay 18,

This invention relates to manifolds and more especially to a construction designed to simplify, render more eflicient and improve generally devices of this character.

The invention has as one of its primary objects to provide a manifold construction so designed that resistance to the gases passing t-herethrough is decreased to a minimum. In the embodiment of the invention herein illustrated and described, this objective is obtained by forming the main conduit of the manifold with a long smooth curve which terminates in straight portions having connection with the cylinder block ports and arranging these straight portions at an obtuse, or in other words, an angle greater than ninety degrees with reference to the axis of the curved manifold portion.

The invention also contemplates internally machining the manifold riser and the straight conduit portions and at the juncture of the conduit curved and straight portions the outer wall is curved while the inner wall is formed with a corner, the angle of which is greater than ninety degrees. With such a construction it is possible to materially decrease resistance and as a consequence to enhance the efficiency of the manifold.

The several objects, advantages and novel details of construction of one embodiment of the invention will be made more apparent as this description proceeds, especially when considered in connection with the accompanying drawings wherein:

Figure 1 is a front elevational View of a manifold constructed in accOrdance with this invention.

Figure 2 is a vertical sectional View taken substantially on the plane indicated by line 2--2 in Figure 1, and

Figure 3 is a horizontal sectional view taken substantially on the plane indicated by line 3-3 in Figure 1.

1n the drawings there is illustrated an exhaust manifold 10 which may be of any suitable or desired construction, this manifold having connection with the cylinder block exhaust orts through passa es 11. Associated with t e exhaust manifo d 10 is an intake manifold 12 and two structures are secured 1927. Serial No. 191,895.

together by means of bolts 13. Inasmuch as the exhaust manifold and its cooperative association with the intake manifold form no particular part of this invention it will not be further referred to in detail.

The intake manifold 12 is provided with a riser 14 having a connection with a carburetor indicated fragmentarily at 15. The riser 14 is provided with two passages 16 and is thus designed to take a double carburetor. The

passages 16 communicate with two separate inlet manifolds 17 and 18, the only communication between the two being an a erture 19' formed in the dividing wall 20 which separates the passages 16;

Each of the manifold units 17 and 18 comprises two longitudinally curved branch conduits 19 which are so curved that together they form a symmetrical long smooth curved conduit as most clearly illustrated in Figure 3. The outer ends of the branches l9 terminate in straight conduit portions 20 flanged as at 21 for connection with the cylinder block ports. The inner wall 22 of each straight portion 20 is machined and the inner walls 23 of the riser 14 are also preferably machined. All -of the curved portions of the manifold are left unfinished.

In order also to decrease resistance, the straight portions 20 are arranged at an obtuse angle to the curved portions or in other words. at an angle greater than ninety degrees with reference to the longitudinal axes of the curved portions. Furthermore, the curved and straight portions 19 and 20 respectively at the inner wall of the conduit at each juncture is provided with an angular corner 24, the angle of which is obtuse or greater than ninety degrees while the outer wall at each juncture is rounded or curved as indicated at 25.

With such a construction, it has been found that the gases flowing through the manifold are offered considerably less resistance so that an increased efiiciency of a noticable degree is realized. It will beapparent that the principles of this invention may'be incorporated and the advantages obtained with structures which differ ifically from that herein illustrated as neither the particular form of double unit manifold nor the particular angular relation of the parts is essential to the successful operation of the manifold and as a consequence reservation is made to make such changes in details and design as may come within the purview of the accompanying claims.-

W'hat I claim as my invention is 1. In a manifold, a riser having a carburetor connection and a pair of branch conduits curved longitudinally and terminating in angularly extending straight ends, each conduit having an angular corner at the inner side of the juncture of the curved and straight portion and a rounded contour at the outer side thereof.

2. In a manifold, a longitudinally curved conduit terminating in angularly extending straight end portions, the inner walls of the conduit at the juncture of the curved and straight portions meeting at an obtuse angle forming a corner while the walls at the outer side are rounded.

3. In a manifold, a longitudinally curved conduit terminating in angularly extending straight end portions, the wall of the conduit at the outer side of the juncture of the curved and straight portions being rounded, said walls meeting at an obtuse angle at the inner side of the juncture.

4. In a manifold, a straight internally machined riser having a carburetor connection, a pair of longitudinally curved branch conduits connected thereto and together forming a long symmetrical curve and straight internally machined conduits sections connected to the end of said branch conduits and arrangedin the same general plane as said branch conduits but at an obtuse angle thereto, the walls of the conduits at the juncture of said curved and straight portions being curved at the outer side of said juncture and forming an angular shoulder at the inner side of said juncture.

5. In a manifold construction, a straight riser having a carburetor connection, a pair of longitudinally curved conduits of different lengths connected to said riser and longitudinally spaced straight conduit sections arranged in the plane of said curved conduits and connected to the ends thereof at an obtuse angle, as and for the purpose set forth.

6. In a manifold, a riser having a pair of passages and constructed for connection to a dual carburetor, a pair of branch conduits connected to each passage of said riser, each pair of conduits being shaped whereby they together form a substantially long smooth curve and straight portions connecting the ends of said branch conduits to the cylinder ports, said straight portions being arranged at an angle greater than ninety degrees with reference to the longitudinal axes of the curved portions.

I 7. In a manifold, a riser provided with a pair of separate passa es adapted for connection with a dual car uretor, a pair of oppositely extending horizontally arranged ranch conduits connected with each passage of said riser and united with one another to form an integral construction each pair of branch conduits being longitudinally curved whereby they together form a substantially smooth curve, the outer ends of each branch conduit terminating in straight portions adapted for connection with the cylinder block ports, the said straight portions being arranged at an angle greater than ninety degrees with reference to the longitudinal axes of the curved portions.

In testimony whereof I afiix my signature.

EARLE S. MACPHERSON. 

